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sbcl/.quicklisp/dists/quicklisp/software/cffi_0.20.1/examples/gethostname.lisp

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+;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
+;;;
+;;; gethostname.lisp --- A simple CFFI example.
+;;;
+;;; Copyright (C) 2005-2006, James Bielman  <jamesjb@jamesjb.com>
+;;;
+;;; Permission is hereby granted, free of charge, to any person
+;;; obtaining a copy of this software and associated documentation
+;;; files (the "Software"), to deal in the Software without
+;;; restriction, including without limitation the rights to use, copy,
+;;; modify, merge, publish, distribute, sublicense, and/or sell copies
+;;; of the Software, and to permit persons to whom the Software is
+;;; furnished to do so, subject to the following conditions:
+;;;
+;;; The above copyright notice and this permission notice shall be
+;;; included in all copies or substantial portions of the Software.
+;;;
+;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+;;; DEALINGS IN THE SOFTWARE.
+;;;
+
+;;;# CFFI Example: gethostname binding
+;;;
+;;; This is a very simple CFFI example that illustrates calling a C
+;;; function that fills in a user-supplied string buffer.
+
+(defpackage #:cffi-example-gethostname
+  (:use #:common-lisp #:cffi)
+  (:export #:gethostname))
+
+(in-package #:cffi-example-gethostname)
+
+;;; Define the Lisp function %GETHOSTNAME to call the C 'gethostname'
+;;; function, which will fill BUF with up to BUFSIZE characters of the
+;;; system's hostname.
+(defcfun ("gethostname" %gethostname) :int
+  (buf :pointer)
+  (bufsize :int))
+
+;;; Define a Lispy interface to 'gethostname'.  The utility macro
+;;; WITH-FOREIGN-POINTER-AS-STRING is used to allocate a temporary
+;;; buffer and return it as a Lisp string.
+(defun gethostname ()
+  (with-foreign-pointer-as-string ((buf bufsize) 255)
+    (%gethostname buf bufsize)))